Pum Lefebure wears mostly black and white because, she says, “it’s clean and simple, timeless and super chic.”

For the same reasons, the chief creative officer of Design Army, a graphic design and branding firm, sticks with a similar strategy in the home she shares with husband Jake, Design Army’s chief executive, and daughter Sophie, 14. Their airy four-level, 5,000-square-foot custom house is clean and minimalist, a mixture of old and new, serious and playful.

It’s partially a reaction to the Lefebures’ work life, which is full of colorful visual stories and branding campaigns for high-profile clients. (A recent short film produced for CityCenterDC featured Washington Ballet dancers dressed in dizzying neon suits and dresses.)

“I deal with color all day long; our work is so colorful that at home I want a clean palette,” said Pum, 43, a native of Thailand.

Jake and Pum work as a team 24/7. In the office and at home, he’s the practical business guy, and she takes the lead on design.

“Some couples separate work and home, but for us it’s about integrating them and blending them and making sure our house is at least visually separate from work,” Pum said. They recharge from their high-speed workdays in calm and quiet.

“With black and white, you can’t go wrong,” said Jake, 45. “It’s timeless. You can swap out things. Even our Christmas tree is black and white.” So is Luna, their French bulldog.

Pum and Jake’s dramatic house in Washington, D.C., where they have lived since 2014, was designed by Studio Twenty Seven Architecture. A “floating” steel staircase down the middle connects the floors; a back wall of almost total glass allows lots of light. Inside, Pum worked with Washington interior designer Darryl Carter, a kindred spirit and fellow risk-taker who shares Pum’s love of old paintings, Paris flea-market finds, well-edited rooms and neutral palettes. The interiors are painted white, coated with a textured finish to add character. Herringbone floors are stained ebony.

“Pum gravitates toward things that are very high-style,” Carter said. “It’s very European the way she gathers the things that appeal to her.” Despite the two-color policy, there are subtle splashes of other hues, such as the pale pink in Pum’s top-floor office and the yellow in Jake’s den on the lower level.

The interiors are full of clever juxtapositions: modern and antique, luxurious and everyday, smooth and textured. Take the open shelving in the kitchen stacked with all-white dishes: milky Astier de Villatte platters handmade in Paris mix with unglazed off-the-rack Crate and Barrel Mercer plates. The living room has an Usona bench carved from a chunk of cedar, a cream and white cowhide rug and two 1950s leather sling chairs designed by Brazilian architect Paulo Mendes da Rocha. In the guest room, a pair of 19th-century Austrian beds in a white painted finish are set off by a woven recycled-leather rug from Garnet Hill.

“At home, I want that homey feeling,” Pum said. “I had the idea that I wanted modern, but not a completely cold look.” The house has lots of old French portraits as well as bold Expressionist paintings, and metal contemporary lighting mixed with romantic antique European ceiling fixtures and sconces, some lit by candles. Pum travels extensively for work; she loves shopping wherever she is, especially in France.

Birth of a business

The Lefebures met in 1996 at a design studio and married in 2001. Two years later, they started Design Army, which now has a staff of 21 and clients including PepsiCo, the Ritz-Carlton, Adobe and Marriott International.

In 2005, they found a 1926 American Foursquare in a quiet neighborhood near their office and Sophie’s school. The place was worn out, and they knew they would totally remodel it in a few years, as budget permitted. Jake began gutting it himself on weekends, but they soon realized it would be better, and cheaper, to start over. In 2010, Studio Twenty Seven knocked it down to the foundation and began building a house to better suit the family’s needs.

“It’s very strong in its statement and very much like they are. ... They are very confident in their opinions on design and what is the essence of an idea and what is fluff,” said John Burke, an architect and co-founder of Studio Twenty Seven.

Burke designed a modern facade to capture the details and scale of the original 1926 house, including a large front porch with wide stairs and a hip roof. With aging parents in mind, the basement level — which has a guest room, full bath, laundry room and Jake’s den — has wider doors and showers and sinks accessible to wheelchairs. The main floor is a vast, open space with a kitchen, dining and living area, plus a powder room. The second floor has Jake and Pum’s bedroom, Sophie’s bedroom, a guest room and two full baths. The top floor is a light-filled loft housing Pum’s office, an art and study corner for Sophie, and a half-bath.

“Jake and Pum never stop working. It was important that the house reflect that lifestyle,” Burke said. “There has to be the ability to be creative in any room, whether work or play.”

Jake does most of the cooking, and he wanted a clean and simple kitchen space with a big counter (a 15-foot expanse of white marble) so the family can gather round. Nearby is an 11-foot-long table designed by Carter from 100-year-old oak.

Upstairs, each bedroom evokes a different feeling. The master bedroom has a kind of medieval vibe, with a grand bed surrounded by luxurious hangings of gray velvet on the inside and white linen and wool on the outside. “I wanted a canopy bed, so I can close the curtains. I feel like I’m in a tent,” Pum said.

Sophie has made her bedroom her own, stringing lights around her bed, covering her walls with her drawings and growing a row of succulents in her sunny window.

The top floor is Pum’s world. Part office and part art studio (and occasional mother-daughter hangout), the space is bathed in light and looks out over the trees. “Yes, it’s a little more girly here,” said Pum, who added a few pale pink accents to the room. She burns a Buly 1803 Generaux d’Empire scented candle on the 19th-century partner’s-style library table, painted in a black gloss finish, that serves as her desk. She pins photos and ideas to a moodboard on the wall.

Three floors down is Jake’s den (they text each other). It’s a place to chill, and there’s a nice big sectional sofa with nailhead trim designed by Carter. There are two saffron velvet midcentury modern chairs by Augusto Bozzi and a 19th-century painting, all Pum finds from France.

The house is yet another collaboration for the plugged-in couple, who just opened At Yolk, a 10,000-square-foot arts space in the warehouse district of Hyattsville, Md.

“Our house is clean and minimal, but highly detailed — like good design,” Jake said. “What makes Pum and I so compatible — and our house — is that we both have passion for good design. We might disagree on a lot of things, but good design is never arguable.”